Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e0cc77ad4a008f5…

MALICIOUS

PDF

78.8 KB Created: 2021-09-02 09:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5b16a7e551cdc52a1eda05e2c8810559 SHA-1: 80fdb5320dc3e13af55aa080986fa0c6d2e79765 SHA-256: 5e0cc77ad4a008f53e5340093bd4cb671c3011d4ce16705018d092f0d75369ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, suggesting the PDF's purpose is to lure users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ff811f302---40683998449.pdf In PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/rizezazata.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d81168f5c7---reselin.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f8e92a71a47---31613783837.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/mulogoforipim.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/zerujulufutavavateg.pdfIn PDF document text
    • http://cortabellanews.com/userimages/mezov.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66772818064.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/sijukitupuwukobuzeselazi.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16121c0cfad29d---pekovobikifoni.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/vimimo.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/97480447038.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/zosavexelavon.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/9706941720.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b81681b76f3---94012104169.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/45153983526.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/86775683313.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/bba8b1115bc6aaa55af5916e4f88156c/53100559467.pdfIn PDF document text
    • http://goref.ru/files/file/23765989460.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/db7cbc24d3bda36c82e38fcb0a80fcea/gisoze.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/83d36b61d4b04af0bb8904c90dd19950/84193099753.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccea9573f54---fotesogirazizifojunute.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/51954846029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=3d+max+learning+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ceb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB3 17832 bytes
SHA-256: 2a0f3b436e3991cb8948df7aaec0e6265c0a640f307f25b47c211968be927008
font_01_sfnt_off0000fcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF5 10632 bytes
SHA-256: f6b2e0491a8be0ac27616a7f0271a8a0f4b884174a00cd0d134fe710beffda7d
font_02_sfnt_off000114f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1